US2998408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polymeric polymethylene terephthalate using certain polyhydric organic compounds as catalysts
Assignee: Onderzoekings Instituut Research
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Filing: 1956-04-23
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Granted: 1961-08-29
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Expires: 1976-04-23
Abstract
No abstract record available.
Inventors
- 👤 Gijsbertus J Zoetbrood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:26
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G63/16; C08G63/20; C08G63/78; C08G63/82; C08G63/87
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
PROCESS FOR PREPARING FILAMENT- AND FILM-FORMING POLYMERIC POLYMETHLYENE TEREPHTHALATES, WHICH COMPRISES FORMING A REACTION MIXTURE OF A GLYCOL OF THE GENERAL FORMULA HO(CH2)NOH IN WHICH N IS AN INTEGER FROM 2 TO 10 AND A METHYL TEREPHTHALATE, SUBJECTING THE REACTION MIXTURE TO AN ESTER INTERCHANGE REACTION IN THE PRESENCE OF AN SETERFICATION CATALYST, INCORPORATING IN SAID REACTIOM MIXTURE BEFORE THE ESTER INCHANGE REACTION HAS BEEN COMPLETED, FROM 0.05 TO 1% BY WEIGHT OF THE METHYL TEREPHTHALATE OF AN ADDITIVE THAT ACCELERATES THE POLYCONDENSATION REACTION, SADI ADDITIVE BEING AN ORGANIC EPOXY COMPOUND SELECTED FRON THE GROUP CONSISTING OF
Claim 2
Dependent Claim
97 words
PROCESS FOR PREPARING FILAMENT- AND FILM-FORMING POLYMERIC POLYMETHLYENE TEREPHTHALATES, WHICH COMPRISES FORMING A REACTION MIXTURE OF A GLYCOL OF THE GENERAL FORMULA HO(CH2)NOH IN WHICH N IS AN INTEGER FROM 2 TO 10 AND A METHYL TEREPHTHALATE, SUBJECTING THE REACTION MIXTURE TO AN ESTER INTERCHANGE REACTION IN THE PRESENCE OF AN SETERFICATION CATALYST, INCORPORATING IN SAID REACTIOM MIXTURE BEFORE THE ESTER INCHANGE REACTION HAS BEEN COMPLETED, FROM 0.05 TO 1% BY WEIGHT OF THE METHYL TEREPHTHALATE OF AN ADDITIVE THAT ACCELERATES THE POLYCONDENSATION REACTION, SADI ADDITIVE BEING AN ORGANIC EPOXY COMPOUND SELECTED FRON THE GROUP CONSISTING OF
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |